How much sea level rises?

It is said that too much greenhouse gas in the atmosphere upsets the earth’s natural balance. One of the consequences of an excessive greenhouse gas in the atmosphere is sea level rise. Global sea level has kept rising, and the average sea level in the world rose by about 7 inches over the last 100 years. Scientists warn that it could rise by 4 feet by 2100, if we keep adding greenhouse gas to the atmosphere.